Automatic train-stop.



PATENTED APR. 30, 1907.

F. B. COREY. AUTOMATIC TRAIN STOP.

APPLIOATION FILED SEPT. 19, 1906.

Hines 0g (Atty.

UNITED STATES PATENT OFFICE.

FRED B. COREY, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION AUTOMATIC OF NEW YORK.

THAI N-STOP.

Patented April 30, 1907. I

Application file September 19, 1906. Serial No. 336,235.

To all whom, it may concern.-

Be it known that I, FRED B. COREY, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Automatic Train-Stops, of which the following is a specification.

My invention relates to automatic trainstops, and consists in an improvement of the invention described in Patent N 0. 828,386, granted to me August 14, 1906.

It has frequently been the custom heretofore to employ stop-arms controlled by sigbetween .the

nals arranged to engage a brake-controlling device on a passing car, so as to applythe brakes if the car tries to pass a signal set at danger. It is sometimes desirable to permit a train to pass a danger signal at low speed, and the arrangement of my former patent had this object in view. Toaccomplish this result, in the arrangement of my former patent the stop-arm was made flexible, but with high inertia, so as to yield if struck by a slowly moving object; but to offer high resistance if struck by a rapidly moving object.

By my present invention I am enabled to make the stop-arm, which is less accessible for inspection and repair than the parts on the car, in the form of a rigid iron bar controlled by the signal. I secure this result by placing on the car a movable member possessed of high inertia with a controlling device on the car adapted to be engaged by this member upon its movement beyond a predetermined limit. On a slowly moving car this movable member, on engaging the stop-arm, is moved only a sufficient amount to allow it to pass the arm; but on a rapidly moving car, owing to its inertia, the movable member will be swung a much greater distance, so as to engage the controlling device.

My invention will best be understood by reference to the accompanying drawings, in which Figure 1 shows a train-stop apparatus arranged in accordance with my invention; Fig. v2 shows on a larger scale the connection stop-arm and the signal; and Fig. 3 shows the apparatus on a still larger scale with particular reference to the parts on the car.

In the drawings, A represents a block signal, which controls by a mechanical or other operative connection an arm B, which is placed beside the track. The arm is raised into the position shown when the signal is at I danger and lowered when the signal is at 1 clear position.

C represents a car carrying the weighted pendulum D, which is designed so as to possess high inertia, in a position to be engaged by the stop-arm B. If the car is moving I slowly, the pendulum D on striking the stopf arm will be moved only a sufiicient distance to enable it to slide over the stop-arm, but on a rapidly moving car the impulse given to the pendulum by the, stop-arm will carry it to a practically horizontal position, in which its cam-shaped upper surface engages and opens the pilot-valve E, shown in dotted lines in Fig. 3. This pilot-valve, which may be of any suitable construction, controls a brakecontrolling valve F by exhausting the air i from the upper side of a piston G, which is normally exposed on both sides to the trainpressure, and which is normally held in the position shown by a compression-spring H. The piston G carries a normally-closed valve I, which, when the piston rises, exhausts the train-pipe J. In order to hold the relay valve E open, catches K are provided, which hold the pendulum D in horizontal position, and consequently in engagement with the relay-valve.

I do not desire to limit myself to the particular construction and arrangement of parts here shown, but aim in the appended claims to cover all modifications which are within the scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is,

1. An automatic train-controlling device comprising a stop-arm on the roadwa a movable member on a car possessing 'gh inertia and adapted to be engaged by said stop-arm, and a controlling device on the car arranged to be operated by a movement of limits.

2. An automatic train-controlling device comprising a stop-arm on the roadwa a movable member on a car possessing h igh inertia and adapted to be engaged b said the car arranged to be operated by said member upon its movement beyond predetermined limits. I y

3. In a block signal system for railways, a

the movable member beyond predetermined stop-arm, and a brake-controlling va ve on signal, a stop-arm controlled thereby, amovable member on a car possessing high inertia and adapted to be engaged by said stop-arm, and a controlling device on the car arranged to be operated by a movement of the mov able member beyond predetermined limits.

4. In a block signal system "forrailways, a signal, a stop-arm controlled thereby, amovable member on a car possessing high inertia and adapted to be engaged by said stop-arm, and a brake-controlling valve on the car arranged to be operated by a movement of said -member be ond predetermined limits.

5. In a block signal system for railways, a signal, a stop-arm controlled thereby, a movable member on a car possessing high inertia and ada ted 'to be engaged by said am, a relay va vearranged to be struck and opened by said member upon a movement thereof beyond predetermined limits, and a brakecontrolling' valve controlled by said relay valve. I

6. In a block signal system forrailways, a signal, a stop-arm cont/rolled thereby, a movable member on a car possessing high inertia and ada ted to be engaged by said .arm, a relay va by said member upon a movement thereof beyond predetermined limits, a brake-controlling valve oontrolled'by said relay valve, and a catch adapted to engage said member upon its movement into engagement with the relay valve.

7. In a'block signal system for railways, a signal, a stop-arm controlled thereby, a movable member on a car possessing high inertia and adapted-to-be engaged by said stop arm, a brake-controlling device 'on the car arranged to be operatedbya movement of said member beyondpredetermined limits, and a catch adapted to engage said member upon its movement into engagement with said dev1ce.

In witness whereof, I have hereunto set my hand this 18th day-of September, 1906.

FRED B. COREY. Witnesses: I

BENJAMIN B. HULL HELEN ORFORD.

ve arranged to be struck and opened 

